Nearly chirp-free electroabsorption modulation usingInGaAs-InGaAlAs-InAlAs coupled quantum wells |
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Authors: | Hou H.Q. Chang T.Y. |
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Affiliation: | AT&T Bell Labs., Holmdel, NJ; |
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Abstract: | We present an electroabsorption modulator based on slightly asymmetric InGaAs-InGaAlAs-InAlAs coupled quantum wells operated in the normally-off mode. The device exhibits a large change of the absorption coefficient in the vicinity of the zero-bias exciton peak wavelength with a very small change of the refractive index. The maximum excursion of the chirp parameter over the entire span of the bias voltage is less than ±0.1 for a specific wavelength or ±0.4 over a 12~14 -nm range. This structure is promising for low-chirp, high bit-rate electroabsorption modulators |
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